MCP6421 datasheet(5/34 Pages) MICROCHIP

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DS25165A-page 5

MCP6421

1.3

Test Circuits

The circuit used for most DC and AC tests is shown in

Figure 1-1. This circuit can independently set VCM and

VOUT (see Equation 1-1). Note that VCM is not the

circuit’s Common mode voltage ((VP +VM)/2), and that

VOST includes VOS plus the effects (on the input offset

error, VOST) of the temperature, CMRR, PSRR and

AOL.

EQUATION 1-1:

FIGURE 1-1:

AC and DC Test Circuit for

Most Specifications.

TABLE 1:

TEMPERATURE SPECIFICATIONS

Electrical Characteristics: Unless otherwise indicated, VDD = +1.8V to +5.5V and VSS = GND.

Parameters

Sym

Min

Typ

Max

Units

Conditions

Temperature Ranges

Operating Temperature Range

-40

—

+125

°C

Note 1

Storage Temperature Range

-65

—

+150

°C

Thermal Package Resistances

Thermal Resistance, 5L-SC70



—

331

—

°C/W

Thermal Resistance, 5L-SOT-23



—220.7

—

°C/W

Note 1:

The internal junction temperature (TJ) must not exceed the absolute maximum specification of +150°C.

F RG



DD 2



 2



OUT

DD 2





–

 V

OST 1GDM



Where:

GDM = Differential Mode Gain

(V/V)

VCM = Op Amp’s Common Mode

Input Voltage

(V)

VOST = Op Amp’s Total Input Offset Voltage (mV)

OST

IN –

IN+

–

VDD

VOUT

CB2

CB1

100 k



100 k



VDD/2

100 k



100 k



30 pF

100 k



1µF

100 nF

VIN–

VIN+

6.8 pF

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